Money is called ‘currency’ because it flows. It works just like water. Flowing from a high point to a low point until it finds it’s own level. As an example look at East and West Germany when the wall came down.

A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics. (Wikipedia)

Cats are creatures of habit, they are also curious. Put a box down in a room with a cat and the cat will walk round it suspiciously then probably end up climbing into the box wanting to know all there is to know about this new object in their lives.